Method for obtaining metallic attachments for incandescent lamps.



P. AZARIA.

METHOD FOR OBTAINING METALLIC ATTAGHMENTS FOR INGANDESOENT LAMPS. APPLICATION FILED JULY 28, 1909.

946,192. Patented Jan. 11,1910.

2 SHEETS-SHEET l.

934} AMRZZQ 7' P. AZARIA. METHOD FOR OBTAINING METALLIC ATTACHMENTS FOR INOANDESOENT LAMPS.

APPLICATION FILED JULY 28, 1909.

946, 1 92, Patented JanQll, 1910.

2 SHEETS-SHEET 2.

I MWQ/ W Hanan AzAnIA, or P RIS, FRANCE;

Mn IIon Ton OBTAINING MnTALLIo ATTACHMENTS ron INoAnnEscnNT LAMPS.

Specification of Letters Patent.

Patented Jan. 11, 1910.

Application filed July 28, 1909. Serial 510,100.

To all whm itmay concern:

Be It known that I, PIERRE AzAnIA, citizen .i of the French Republic, residing at Paris,

Department of the Seine, in'France, have invented certain new and useful Improvements inMethods of Obtaining Metallic Attachments for Incandescent Lamps; and I do hereby declare the following to be a full, clear, and: exact descri tion of the invention, such as will enable ot ers skilled in the art to which it appertains to make and use the same. I

generally fixed to their :metallic lamps are v 1101 ers b means of a paste havingcarbon or ground metal for a base and containing a er plastic material which becomes hard un the action of heat. The attachment thus obtained is sufficiently steady and a rather good electricco'nductor but has the great inconvenience of retaining in its pores oceluded gases which are verydiflicult to eliminate during the vacuum operation. If in incandescent lamps metallic fila-.

mentsare used, itis :possible to connect these filaments to their holders by means of a connection formed entirely with molten metal. i

This invention consists in anew method'of autogenous soldering using'only the radiant heat of accessory incandescent bodies and allowing of obtaining a very strong and nonporous joint. To carry out this peculiar method of solderin the metallic holders, gen-- erallyaconsistingo wires of nickel of an a lay of nickel fixed in star fashion on a glass tube are terminatedat the end. where the soldering has to be effected by a very small eye or loop allowing of guiding the filament. The

latter is suspended 'from hooks or rings of metal, carbon, or other material, fixed in star fashion on a glass tube placed in the axis of the lamp. Sometimes the hooks'or rings serve only to maintain the filament during the solderin operation and are afterward removed. e glass. tube which carries the filaments is placed in a closed space in which gases can be caused to circulate. Near each holder, at a distance of less than a millimeter and below the oint to be soldered, an electric conductorfis placed which iscapable of being quickly peratureby the passage of an electric current. The conductors may be 'formed of rods, wires,- stri s or the like, of a refractory material such or example as platinum or The lighting filaments of incandescentcapillary attraction,

"spherelwhich firmlyincloses the branch of located on a plate brought to a very high teml carbon. There may be a special conductorcorresponding with each part. to be soldered or a single conductor of a special shape maybe emp oyed passing. near all the points where a soldering has to be efi'ective. being thus prepared, a reducing gas, which is a good conductor of heat, suchas hydrogen is introduced into the said space and an intense electric current is caused, to pass All through the conductor or conductors. Being instantaneously, brought to a white red heat the conductor or conductors,- by radiation and by virtue of the calorific conductibility of the gasheat the ends of the metallic holders placed very nearand above. The metal of these supports melts and forms, by a very small metallic e filament in its center, thus forming-a erfect autogenous soldering from a mechanical and electric point of View, between the filament and its metallicholder. In a moment all the soldering of the lamp comprising several filaments can be efi'ected in this manner. The execution of these solderings' is, in a way,'automatic. As soon as the small sphere of melted metal inclosin the branch of the filament has been tonne of a support the distance to the incandescent fusion without it bein guish the heating con uctor.

' The accompanying drawing gives by way of example an apparatus which allows the execution of this process.

at the end conductor increases suflioiently to stop the necessary to ext-inv .Figure 1 is an elevation view of this apparatus. Fig. 2 is a plan. view.

This apparatus comprises-a glass hell '1- 2 covered by a sheet of A ipe 4 allows to exhaust bell or to introduce a gas in the same, and serves also as supports for the central stem 6 of the lamp in fabrication. The lighting body is constituted by india rubber Z the air from the filaments 7 suspended to insulated hooks 8.

The filaments" are electrically'connected by the intermediary of V-shfaped rods 9. These rods arefixed with the filamentsby means of the process object of the invention. Two uprights 10, 10 are located. on a plate 11 and insulated from the same. Each of them bears pincers 12 and 13. The pincers 12 are electrically connected to the upright and the incers-18 are insulated from the same by a blade of mica Between the pincers 12 and 13 is located a thin conductor 14 of refractory material which passes near the points to be welded. The incers 13 13 are connected by a wire 15. en everything is in place for operation, vacuum is made in the bell, and hydrogen is introin causing anintense electric current to ,pass through conductors of refractory material placed near the points where the soldering is to be effected and heating them by radiation.

2; A process of autogenous soldering for connecting the metallic filaments of incandescent lamps to their holders, consisting, in causing an intense electric currentto pass through conductors of refractory material placed near the points where the soldering is to be effected and heating them by radiation, the operation taking place in an atmosphere of hydrogen or any other reducing gas which is a good conductor of heat.

In testimony whereof I affix my signature,

in presence of two witnesses.

v PIERRE AZARIA.

Witnesses:

H. C. Coxn, GEORGES BOUJU. 

